<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="sex">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click.prevent="add(index)">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in arr" :key="item.id">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.sex }}</td>
          <td>
            <button @click.prevent="del(item.id)">删除</button>
            <button @click.prevent="change(item.id)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      flag: "",
      sex: [],
      name: "",
      age: "",
      arr: [],
      index: 1,
    };
  },
  methods: {
    add() {
      if (
        this.age.trim().length === 0 ||
        this.name.trim().length === 0 ||
        this.sex.length !== 1
      ) {
        return alert("内容不能为空");
      }

      if (!this.flag) {
        this.arr.push({
          sex: this.sex,
          name: this.name,
          age: this.age,
          id: +new Date(),
        });
      } else {
        this.flag.name = this.name;
        this.flag.age = this.age;
        this.flag.sex = this.sex;
      }
      this.name = "";
      this.age = "";
      this.sex = "";
      this.flag = "";
    },

    del(id) {
      this.arr = this.arr.filter((item) => item.id !== id);
    },
    change(id) {
      const obj = this.arr.find((item) => item.id === id);
      this.flag = obj;
      this.name = obj.name;
      this.age = obj.age;
      this.sex = obj.sex;
    },
  },
};
</script>
